SAEED MDCAT
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The value of universal gas constant R is
Which of the following possess maximum root mean square velocity at same temperature?
If then CP in
The average K.E of hydrogen molecules at 300 K is E. At same temperature K.E of oxygen molecules will be
If the volume of a given mass of a gas is doubled at atmospheric pressure then the temperature of the gas rises from 127°C to
The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be
Which of the following is expression of mean square speed of ‘N’ gas molecules contained in a cylinder
As shows that . What is also true?
In the diagrams (i) to (iv) of variation of volume with changing pressure is shown. A gas is taken along the path ABCDA. The change in internal energy of the gas will be
Estimate pressure of air molecules at 273K, if the mean square speed is v^{2} 500m^{2}/s^{2} and density of air under these conditions is 6kg/m^{3}:
A vessel contains 1 mole of O_{2} (molar mass 32g) at a temperature T. The pressure is P. An identical vessel containing 1 mole of He gas (molar mass 4) at a temperature 2T has a pressure
Two different ideal gases are enclosed in two different vessels at the same pressure. If and are their densities and c1 and c2 are their rms speeds, respectively, then is equal to
In the mass of all molecules of a gas are halved and their speed is doubled, then the ratio of their initial and final pressure is
Which of the substances A, B, or C has the lowest specific heat?
The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at
According to kinetic energy of gases, root mean square (rms) velocity of a gas is directly proportional to:
Two identical sample of a gas are allowed to expand (i) isothermally (ii) adiabatically. Work done is
The r.m.s velocity of hydrogen gas molecules at S.T.P. is ν m/s. the gas is heated at constant volume till the pressure becomes 4 times. The final r.m.s. velocity is,
According to kinetic theory of gasses at absolute zero temperature
If CP – CV = R and , then which relation is correct
If a cylinder containing a gas at high pressure explodes, the gas undergoes
The characteristic equation of gases PV = nRT holds good for
The processes or systems that do not involve heat are called
The state of an ideal gas was changed three times at three different temperatures. The diagram represents three different isothermal curves. Which of the following is true about the temperature of the gas?!vml]–>
The average molecular kinetic energy of a gas depends on:
Which of the following expression is correct for molar volume Vm of an ideal gas
The pressure of an ideal gas is doubled in an isothermal process. The root mean square speed of the molecules
A sample of an ideal gas taken through a closed cycle is presented by the PV diagram. The process 12 is perfectly isothermal. Which of the following is true about the change in internal energy and work done by the gas during the process 12?
The specific at constant temperature is
Which of the following is relation for V_{rms}
What thermodynamic temperature is equivalent to 501.85 °C?
In the relation of , n is
Cloud formation in atmosphere is an example of
The temperature of a gas is increased from 27°C to 127°C. The ratio of its mean kinetic energies will be.
110 Joules of heat are added to a gaseous system, whose internal energy is 40 J. The amount of external work done is
The speeds of 5 molecules of gas (in orbitrary units) are as follows. 2, 3, 4, 5, 6The root mean square speed for these molecules is
A system does 600J of work at the same time has its internal energy increased by 320J. How much heat has been supplied.
In adiabatic expansion
A and B are two gases where T is the temperature and M is the molecular mass. If vA and vB are rms speeds, then will be:
The internal energy of 1 mole of an ideal gas depends on:
At what temperature the kinetic energy of gas molecules will be double of its value at 27°C?
The correct relation connecting the universal gas constant (R), Avogadro number NA and Boltzman constant (K) is
A cycle tyre bursts suddenly. This represents an
The average kinetic energy of hydrogen molecules at 300 K is E. At the same temperature, the average kinetic energy of oxygen molecules will be
The difference of molar specific heats at constant pressure and constant volume is called:
Pressure exerted by a perfect gas is equal to
At constant pressure the volume of the given mass of a gas is V at temperature T. At what temperature volume of the gas will be 4V:
Which one of the expressions is correct for the molar volume Vm of an ideal gas?
According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process:
If the volume of the gas is to be increased by 4 times, then
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